"This is only the second time Google has added such guidance on troubling search terms, Dr. Roni Zeiger, chief health strategist for Google, said in an interview. A few months ago, the search engine began providing a phone number for the national poison control hotline after searches like [poison emergency]," reports the New York Times.

Unfortunately, it's difficult to measure how effective Google's OneBox result is, since there's no link and you can't start the call directly from Google's search result page.